[R] Problems with coxph and survfit in a stratified model with interactions
rm at wippies.se
Sat Oct 13 22:52:23 CEST 2012
I’m trying to set up proportional hazard model that is stratified with
respect to covariate 1 and has an interaction between covariate 1 and
another variable, covariate 2. Both variables are categorical. In the
following, I try to illustrate the two problems that I’ve encountered, using
the lung dataset.
The first problem is the warning:
To me, it seems that there are too many dummies generated.
The second problem is the error:
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